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Fair Value Of Financial Instruments
3 Months Ended
Mar. 31, 2024
Fair Value Disclosures [Abstract]  
Fair Value Of Financial Instruments Fair Value Measurements
    The Company’s fixed maturity available for sale securities, equity securities and its arbitrage trading account securities are carried at fair value. Fair value is defined as “the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date.” The Company utilizes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels, as follows:
Level 1 - Quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.
Level 2 - Quoted prices for similar assets or valuations based on inputs that are observable.
Level 3 - Estimates of fair value based on internal pricing methodologies using unobservable inputs. Unobservable inputs are only used to measure fair value to the extent that observable inputs are not available.
    Substantially all of the Company’s fixed maturity securities were priced by independent pricing services. The prices provided by the independent pricing services are estimated based on observable market data in active markets utilizing pricing models and processes, which may include benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, sector groupings, matrix pricing and reference data. The pricing services may prioritize inputs differently on any given day for any security based on market conditions, and not all inputs are available for each security evaluation on any given day. The pricing services used by the Company have indicated that they will only produce an estimate of fair value if objectively verifiable information is available. The determination of whether markets are active or inactive is based upon the volume and level of activity for a particular asset class. The Company reviews the prices provided by pricing services for reasonableness and periodically performs independent price tests of a sample of securities to ensure proper valuation.
    If prices from independent pricing services are not available for fixed maturity securities, the Company estimates the fair value. For Level 2 securities, the Company utilizes pricing models and processes which may include benchmark yields, sector groupings, matrix pricing, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, bids, offers and reference data. Where broker quotes are used, the Company generally requests two or more quotes and sets a price within the range of quotes received based on its assessment of the credibility of the quote and its own evaluation of the security. The Company generally does not adjust quotes received from brokers. For securities traded only in private negotiations, the Company determines fair value based primarily on the cost of such securities, which is adjusted to reflect prices of recent placements of securities of the same issuer, financial projections, credit quality and business developments of the issuer and other relevant information.
    For Level 3 securities, the Company generally uses a discounted cash flow model to estimate the fair value of fixed maturity securities. The cash flow models are based upon assumptions as to prevailing credit spreads, interest rate and interest rate volatility, time to maturity and subordination levels. Projected cash flows are discounted at rates that are adjusted to reflect illiquidity, where appropriate.
    
    The following tables present the assets and liabilities measured at fair value on a recurring basis as of March 31, 2024 and December 31, 2023 by level:
(In thousands)TotalLevel 1Level 2Level 3
March 31, 2024
Assets:
Fixed maturity securities available for sale:
U.S. government and government agency$1,829,552 $— $1,829,552 $— 
State and municipal2,552,786 — 2,552,786 — 
Mortgage-backed2,408,018 — 2,408,018 — 
Asset-backed4,239,561 — 4,239,561 — 
Corporate8,162,703 — 8,162,703 — 
Foreign government1,718,252 — 1,718,252 — 
Total fixed maturity securities available for sale20,910,872 — 20,910,872 — 
Equity securities:
Common stocks846,669 843,441 1,059 2,169 
Preferred stocks331,379 — 327,743 3,636 
Total equity securities1,178,048 843,441 328,802 5,805 
Arbitrage trading account1,146,119 752,159 390,284 3,676 
Total$23,235,039 $1,595,600 $21,629,958 $9,481 
Liabilities:
Trading account securities sold but not yet purchased$40,298 $40,298 $— $— 
December 31, 2023
Assets:
Fixed maturity securities available for sale:
U.S. government and government agency$1,716,731 $— $1,716,731 $— 
State and municipal2,634,422 — 2,634,422 — 
Mortgage-backed2,266,455 — 2,266,455 — 
Asset-backed4,187,040 — 4,187,040 — 
Corporate7,654,059 — 7,654,059 — 
Foreign government1,666,229 — 1,666,229 — 
Total fixed maturity securities available for sale20,124,936 — 20,124,936 — 
Equity securities:
Common stocks838,054 835,338 1,158 1,558 
Preferred stocks252,293 — 248,598 3,695 
Total equity securities1,090,347 835,338 249,756 5,253 
Arbitrage trading account938,049 546,110 388,167 3,772 
Total$22,153,332 $1,381,448 $20,762,859 $9,025 
Liabilities:
Trading account securities sold but not yet purchased$9,357 $9,357 $— $— 
    The following tables summarize changes in Level 3 assets and liabilities for the three months ended March 31, 2024 and for the year ended December 31, 2023:
Gains (Losses) Included In:
(In thousands)Beginning
Balance
Earnings (Losses)Other
Comprehensive
Income (Losses)
ImpairmentsPurchasesSalesPaydowns / MaturitiesTransfers In / (Out)Ending
Balance
Three Months Ended March 31, 2024
Assets:
Equity securities:
Common stocks$1,558 $611 $— $— $— $— $— $— $2,169 
Preferred stocks3,695 (2)— — — (57)— — 3,636 
Total5,253 609 — — — (57)— — 5,805 
Arbitrage trading account3,772 (133)— — — — — 37 3,676 
Total$9,025 $476 $— $— $— $(57)$— $37 $9,481 
Year Ended
December 31, 2023
Assets:
Equity securities:
Common stocks$2,599 $(1,041)$— $— $— $— $— $— $1,558 
Preferred stocks11,299 (3)— (7,601)— — — — 3,695 
Total13,898 (1,044)— (7,601)— — — — 5,253 
Arbitrage trading account3,590 117 — — — — — 65 3,772 
Total$17,488 $(927)$— $(7,601)$— $— $— $65 $9,025 
    For the three months ended March 31, 2024 and for the year ended December 31, 2023, securities within the arbitrage trading account portfolio that no longer had a publicly traded price were transferred into Level 3.
Fair Value of Financial Instruments
    The following table presents the carrying amounts and estimated fair values of the Company’s financial instruments:
  March 31, 2024December 31, 2023
(In thousands)Carrying ValueFair ValueCarrying ValueFair Value
Assets:
Fixed maturity securities$20,964,854 $20,967,212 $20,178,308 $20,181,547 
Equity securities1,178,048 1,178,048 1,090,347 1,090,347 
Arbitrage trading account1,146,119 1,146,119 938,049 938,049 
Loans receivable228,766 229,156 201,271 198,244 
Cash and cash equivalents1,169,053 1,169,053 1,363,195 1,363,195 
Trading account receivables from brokers and clearing organizations141,277 141,277 303,614 303,614 
     Due from broker— — 36,747 36,747 
Liabilities:
Due to broker33,027 33,027 — — 
Trading account securities sold but not yet purchased40,298 40,298 9,357 9,357 
Senior notes and other debt1,827,997 1,435,877 1,827,951 1,480,076 
Subordinated debentures1,009,269 893,358 1,009,090 929,598 
    The estimated fair values of the Company’s fixed maturity securities, equity securities and arbitrage trading account securities are based on various valuation techniques that rely on fair value measurements as described in Note 15. The fair value of loans receivable are estimated by using current institutional purchaser yield requirements for loans with similar credit characteristics, which is considered a Level 2 input. The fair value of the senior notes and other debt and the subordinated debentures is based on spreads for similar securities, which is considered a Level 2 input.